yashsingh1/xdaforums huggingface dataset:
[myTouch 4G General] xHKMx:
Ya thats cheap publicity stunt as they trying to show brain washed Americans they are actually doing something. Its all total BS when we should be worried about real issues in USA but we have to deal with these type of BS. I still don't see why we can't just hang them for high treason and get it over with. I know I am harsh but we need this type actions to get rid of these degenerates. It don't matter who we put in office they all part of the same good ol party of BS politicians.
[myTouch 4G General] hammer4203:
This is why freedom no longer exists in the USA! You can't even leave the country of your own will! Gun control is a prime example. My ssn doesn't do squat for me because some killer is in the florida state penitentiary that has the same name as me! They make me wait for a fire arm. Yet my fingerprints and ssn are suppose to help eliminate that issue. The laws are for control not protection! Why would any sane individual hold the head of a dead man up to get his picture taken with them? These are the new soldiers that are being bread. The kind of trash that will do what the government tells them to do. Not what they should no is wrong. Look at law enforcement. My wife use to be in it. Now she is disgraced that it has gotten as bad as it has. Look at education. Kids are being dumbed up instead of taught. The less knowledge, money, skill, and power you have, the more obedient you will be! Just remember George Washington! He knew what to do and when to do it.
[myTouch 4G General] thedude1313:
xHKMx Dude......Sir that was well said!!! well said.........
[Nook Color General] NewZJ:
I love the kubrik reference in title.

so my cheapy microcenter 4gb is why my HC preview was just "okay"
[Nook Color General] xdabr:
Both entertaining and edifying.

Thanks, swoozle! (I mean "swizzlenuts" old pal?)

Now if only that obscure performance metric were easily determined from printed SD card specifications...
[Nook Color General] victle:
Yeah, I have two old 2G uSD (no classified) and both work fine with CM7. The benchmarks are almost as good as the well tested Transcend 4GB class 6, random write speed beat the Transcend, but random read is little bit slower :)
[Nook Color General] acme2ajax:
My Kingmax card works butter smooth with CM7......but always hangs up on nookie froyo....

So, I am gonna buy sandisk now
[Nook Color General] ax135:
I experienced the same thing

All my so call fast cards (class 6 and class 10) worked very slow or had boot problems. After switching the to the Costco Sandisk class 4 card, I was able to use CM7, HD, and all the other images with good preformance from the SD card.
[Nook Color General] patgnds:
I have a Transcend 8gb class 6 and Kinkmax 8gb class 6 none work well. The Transcend is by far the better of the two. I have now ordered a 16GB Sandisk class 2 to see how that works.
[Nook Color General] swoozle:
Update:Transcend

Just a minor addition with a Transcend card. I'd seen many posts that swore by a Transcend Cl 6 8G card through Newegg. I ordered, received, benchmarked and loaded CM7 Nightly 37.

To cut to the chase, the Transcend sucked big hairy monkey balls. Similar small block write speeds as the other crappy cards. And the CM7 performance was predictably bad. Crappy UI response and FCs.

__Test_________Sandisk Cl2 8G___Patriot CL10 8G____Kingston Cl4 4Gig___Transcend Cl6 8G

Sequential Read___10.871 MB/s____20.036 MB/s___________18.700 MB/s___________19.930 MB/s

Sequential Write___6.659 MB/s____13.660 MB/s____________4.277 MB/s___________19.325 MB/s

Rndm Rd 4KB(QD32)__3.077 MB/s_____3.444 MB/s____________2.088 MB/s___________2.968 MB/s

Rndm Wrt 4KB(QD32)_1.791 MB/s_____0.038 MB/s____________0.016 MB/s___________0.029 MB/s

I'm sure any of these would work fine as data cards. But for running off of SD, it makes a huge difference.
[Nook Color General] unicyclingEMT:
Have to agree. Have 3 8gb microSD cards including a Patriot and a Kingston but the only one that reliably runs CM7 is the cheapo SanDisk
[Nook Color General] tyy10002:
+1.

My PNY card was too slow and it took forever to download apps from market (CM7) and I replaced it with a old 8G class 2 sandisk.. Man.. no need to say it..

BTW, anyone why does sandisk makes class 6 or class 10 micro SD card? I did find the extreme III of SD card only... and not the micro card.
[Nook Color General] robot8:
I have been running off a Transcend CL6 8G card and while my install felt zippy and pretty smooth, I have been having some FC issues and random quirkiness. I believe you have smacked the nail on the head here in that what really matters is the speed of the small block random writes. Having ruled out all other possibilities, it is the only thing that may explain why I am having intermittent artifacts in my streaming video.

Thank you for posting your tests and results, gonna go grab an el cheapo Cl2 card asap.

edit: So I picked up a cheap Class 2 Sandisk 8G card and it's been rock solid on the latest nightly 41 with 4.18C test kernel.
[Nook Color General] residentorca:
From my experience using CM7 on different high-speed uSD cards (Kingston, Patriot and Transcend), the results between brands and within brands are inconclusive and inconsistent. I'm beginning to think it has more to do with the individual card, i.e., the luck of the draw (or lack thereof). With such hit-or-miss results, perhaps the best approach is to keep trying until you find a good one.
[Nook Color General] Talesin_BatBat:
I'm having a similar oddity... I have CM7 installed to eMMC, and on an 8GB Class 4 SanDisk MicroSD. The microSD actually boots /faster/, and has less UI lag than the internal memory!

Wondering if I messed up the flash (redid it a few times with no real change), install process, or if the internal memory is actually slower than the microSD somehow. Kind of backward thinking to my mind, but hey...
[Nook Color General] joobu:
I think SD card variability isn't sufficiently highlighted in instructions for running off the SD card. I had issues with a Transcend class 6 4 GB card but no issues with an unclassified 2 GB.

If this issue is highlighted I think it might avoid a lot of frustration.
[Nook Color General] joobu:
I'm seeing similar results with my cards on Random Write 4KB(QD32):

Sandisk Class 4 4GB:_________1.175 MB/s

Random unclassified 2GB:_____0.029 MB/s

Lexar Class 4 8GB:___________0.038 MB/s
[Nook Color General] twobits:
I have only ever seen the sequential speeds quoted in specs. In fact, if the SanDisk was only 10x faster then the Kingston would need to be .16 and not .016 right? So isn't the sandisk actually 50x and 100x faster?

How can we find card with decent random r/w performance though, does anyone spec for that?
[Nook Color General] swoozle:
Woops, you are correct. Missed a zero, thanks.

:p

No, I've never seen such a spec quoted either. I imagine it's because any normal use of an SD card doesn't depend on random write speed so much.
[Nook Color General] BrotherZero:
Hm, here I had given up running anything from an SD since I failed to even boot up either Froyo or CM7 with mine. But I have a 16gb Sandisk class 2 in my other phone! Going to try that then.

Noobquestion, how do you back up an android SD-card? Can I just copy paste the entire card to my pc hard drive, and then transfer it back when I want to use it in my phone again? Or do I have to use some kind of backup program?
[Nook Color General] micksh:
The results are not strange. Card class only reflects sequential speed, but random speed is more important for OS operation. For example, ReadyBoost certified Flash drives have to have certain minimum random access speed.

Similar issue was brought up when people tried to replace SD cards in WP7 phones:

the big issue is random access performance -- a figure that isn't taken into account in a card's class rating. Ironically, Microsoft discovered in its testing that cards with higher class ratings actually performed worse on Windows Phone 7 because the tweaks card manufacturers make to achieve high sequential throughput can actually hurt random access times.

http://www.engadget.com/2010/11/17/windows-phone-7s-microsd-mess-the-full-story-and-how-nokia-ca/

It's good to know that Sandisk cards generally have good random access speed. However, it's not guarantied. They may choose cheaper NAND any time in future.

Added: For guarantied result one may try to find ReadyBoost certified microSD, but I don't know if they exist, probably they certified only USB sticks.

Or, WP7-certified microSD cards just recently started to appear.

http://www.engadget.com/2011/04/15/windows-phone-7-certified-microsd-cards-emerge-at-atandt-stores/

Right now it's probably the same Sandisk card, just repackaged and priced higher. If I were to buy microSD to run OS from I would choose Sandisk and would hope that I'm lucky.

But WP7-certified cards could be a good choice if regular Sandisk cards suddenly become worse or if you just want to be sure, they should have good random access speed.
[Nook Color General] ebubar:
This is surprising to read. I've looked pretty much everywhere and the consensus has seemed to be that the Transcend 8GB, class 6 cards were top notch. Just ordered one off of Amazon too:(. Maybe I should just grab a Sandisk instead.
[Nook Color General] TDO:
Some more benchamrks.

I have noticed that the Sandisk values vary a lot e.g. Random Write 4KB (QD=32) jumps between 0.740 and 1.643. The values from the other cards are rather constant and vary only a little.

Patriot 16 GB Clas 10

-----------------------------------------------------------------------
CrystalDiskMark 3.0.1 (C) 2007-2010 hiyohiyo
Crystal Dew World : http://crystalmark.info/
-----------------------------------------------------------------------
* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

Sequential Read : 19.318 MB/s
Sequential Write : 12.117 MB/s
Random Read 512KB : 19.087 MB/s
Random Write 512KB : 1.502 MB/s
Random Read 4KB (QD=1) : 3.872 MB/s [ 945.3 IOPS]
Random Write 4KB (QD=1) : 0.014 MB/s [ 3.4 IOPS]
Random Read 4KB (QD=32) : 4.057 MB/s [ 990.4 IOPS]
Random Write 4KB (QD=32) : 0.023 MB/s [ 5.7 IOPS]

Test : 50 MB [I: 0.0% (0.0/14.9 GB)] (x5)
OS : Windows 7

Adata 8 GB Class 6

-----------------------------------------------------------------------
CrystalDiskMark 3.0.1 (C) 2007-2010 hiyohiyo
Crystal Dew World : http://crystalmark.info/
-----------------------------------------------------------------------
* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

Sequential Read : 19.877 MB/s
Sequential Write : 11.262 MB/s
Random Read 512KB : 19.590 MB/s
Random Write 512KB : 1.826 MB/s
Random Read 4KB (QD=1) : 3.984 MB/s [ 972.6 IOPS]
Random Write 4KB (QD=1) : 0.014 MB/s [ 3.4 IOPS]
Random Read 4KB (QD=32) : 4.023 MB/s [ 982.1 IOPS]
Random Write 4KB (QD=32) : 0.024 MB/s [ 6.0 IOPS]

Test : 50 MB [I: 0.0% (0.0/7879.0 MB)] (x5)
OS : Windows 7

Sandisk 16 GB Class 2

-----------------------------------------------------------------------
CrystalDiskMark 3.0.1 (C) 2007-2010 hiyohiyo
Crystal Dew World : http://crystalmark.info/
-----------------------------------------------------------------------
* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

Sequential Read : 13.163 MB/s
Sequential Write : 4.568 MB/s
Random Read 512KB : 12.418 MB/s
Random Write 512KB : 4.410 MB/s
Random Read 4KB (QD=1) : 1.159 MB/s [ 283.0 IOPS]
Random Write 4KB (QD=1) : 2.009 MB/s [ 490.4 IOPS]
Random Read 4KB (QD=32) : 1.776 MB/s [ 433.7 IOPS]
Random Write 4KB (QD=32) : 1.643 MB/s [ 401.1 IOPS]

Test : 50 MB [I: 0.0% (0.0/14.8 GB)] (x5)
OS : Windows 7
[Nook Color General] wwejr4540:
Bought a Nook Color on eBay, waiting for arrival, so I've been reading the Nook threads on rooting, ROMs, and this great thread on uSD cards. My phone is a rooted Sprint Hero running aospCMod 2.3.4 so I definitely want to run CM7 initially on the Nook. So I tested all the cards I could find today. chinly43 reported tests of same card in an external reader and in the Nook (a bit slower in the Nook); all my cards were typically slow in a couple of readers, so I tested two of them in my Hero. The results are below and pretty much confounded me. In the reader, the random 4KB writes are dismal; in the phone they are near acceptable. Any ideas?

SanDisk(Hero) 2GB Class 2(?):
in reader in phone
Sequential Read : 9.025 MB/s 10.694 MB/s
Sequential Write : 6.744 MB/s 5.774 MB/s
Random Read 512KB : 8.958 MB/s 15.977 MB/s
Random Write 512KB : 1.229 MB/s 1.101 MB/s
Random Read 4KB (QD=1) : 3.303 MB/s 1.627 MB/s
Random Write 4KB (QD=1) : 0.011 MB/s 0.402 MB/s
Random Read 4KB (QD=32) : 3.397 MB/s 1.996 MB/s
Random Write 4KB (QD=32) : 0.017 MB/s 0.395 MB/s

Transcend(Hero) 8GB Class 6:
in reader in phone
Sequential Read : 16.853 MB/s 12.042 MB/s
Sequential Write : 10.768 MB/s 4.811 MB/s
Random Read 512KB : 16.631 MB/s 12.643 MB/s
Random Write 512KB : 2.079 MB/s 2.919 MB/s
Random Read 4KB (QD=1) : 5.137 MB/s 1.739 MB/s
Random Write 4KB (QD=1) : 0.021 MB/s 0.412 MB/s
Random Read 4KB (QD=32) : 5.236 MB/s 1.679 MB/s
Random Write 4KB (QD=32) : 0.031 MB/s 0.389 MB/s
[Nook Color General] :
How did you benchmark from the phone? I thought everyone's results on here are from the crystal benchmark tool in windows?

Sent from my Nook Color
[Nook Color General] wwejr4540:
When the phone is connected to PC via USB and "USB Storage" is turned on, the memory card in the phone looks like a disk drive to the PC - just like a memory card reader. I think chinly43 did a similar thing with the Nook (see post #82).
[Nook Color General] pchoi94:
CM7 Degraded performance or bad card?

Hi all, I previously posted that I was getting about 0.800 MB/s on the random 4k 32QOD (Sandisk 16GB Class 4 from Radio Shack) and that CM7 was running smooth on my nook. However, little by little it seems I've been having issues with stuttering, and once the nook rebooted completely into the stock internal ROM (by itself) even though the sd card was still inside.

I was wondering if anyone else was having any issues and if it could just be a normal CM7 thing (I'm running the 7.1 stable) or if it could possibly be a bad card? I was planning to return to Radio Shack for a replacement just in case...

by the way, is there a utility i can use to test if the SD card is bad?
[Nook Color General] Taosaur:
I have seen other reports of SD installs developing issues over time, and indeed, when I first went from CM 7.0.3 to the 7.1 beta on SD it ran abysmally, and when I flashed back I had Wi-Fi connection issues and more FCs. Now, there's nothing to say running from SD was responsible for any of that, but it did move me to install on eMMC, which has performed fine and simplified things considerably.
[Nook Color General] :
Did you mean 7.0.3 stable? 7.1 is a beta and will probably have a lot more random bugs or weird behavior. :)

Been running CM7 for at a month now and have gone through 7.0.3 stable, several of the OC kernels and several iterations of the 70, 80, and now 90 series nightlies. I've had random issues but I'm running on the nightlies. And its usually stuff that has known issues for people like wireless and VPN. Sometimes its also with specific apps. No general performance issues though.
[Nook Color General] pchoi94:
ah yes you're right, 7.1 is a beta! =) also btw i'm running the 2.6.32 overclock kernel set to 1.2 and smartass.

the reason I'm running 7.1 is because of the sleep issue being fixed where the battery doesn't get drained while in sleep. OR, was that a feature of the kernel and not the build? sorry, still a noob trying to learn.

on 7.1 my wifi was solid until i installed launcher pro, it seemed, which was strange. i didn't touch the kernel or anything like that, but now whenever i reboot the wifi is off and i have to manually turn it back on.

it seems that my performance issues mostly happen when i try to play any type of streaming video, i.e. flash or youtube. the video usually stutters, then after that the whole OS stutters and lags until i reboot. is that normal?

so what do you think, should i just keep the sd card? or risk getting a slower performer if i exchange at radio shack?
[Nook Color General] Taosaur:
You have several known issues from that kernel and build, which have been addressed in dal's 5/23 kernel (which he strongly recommends over the 5/13 build you're using) and some recent nightlies. You can see changes since the original 7.1 beta in this list: http://cm-nightlies.appspot.com/?device=encore (NC-specific changes have a darker background). I would grab one of those and the more recent OC kernel and see what that does for you.
[Nook Color General] :
What Taosaur said...

You should try the one of the newer nightlies and also the 5/23 kernel.
[Nook Color General] pchoi94:
Will do, thanks for your help!
[Nook Color General] fcanha:
Read all 20 pages of posts yesterday.

Went to Radio Shack after work and picked up a SanDisk 8GB C4 for $17.99.

It came with an adapter and on the back of package it reads

CARD made in Taiwan, ADAPTER made in China.

Used Targus High Speed SD/SDHC/MMC/Micro SD Card reader. Below is Walmart link but found mine at Target.

walmart.com/ip/Targus-USB-2.0-SD-Card-Reader/16617535

Plugged it directly into USB port on 2009 24" iMac running Windoze 7 (32 bit) Pro using Parallels 6.0.11994 with 2G of RAM allocated to the VM.

Results:

-----------------------------------------------------------------------

CrystalDiskMark 3.0.1 (C) 2007-2010 hiyohiyo

-----------------------------------------------------------------------

* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

Random Read 4KB (QD=32) : 2.523 MB/s [ 615.9 IOPS]

Random Write 4KB (QD=32) : 1.141 MB/s [ 278.5 IOPS]

Test : 50 MB [G: 0.7% (51.7/7572.0 MB)] (x5)

Date : 2011/06/09 21:34:12

OS : Windows 7 SP1 [6.1 Build 7601] (x86)

Two previous tests resulted in:

2.5/1.1 and 2.4/0.9

Thanks to All for the great posts.
[Nook Color General] Blue6IX:
Regarding the previous post:

Type of reader used absolutely makes a difference.

I did a series of tests in order to determine that, shown in this thread I started a week ago.

I just finished 250 benchmarks with 5 cards and 10 readers ( 5 sd adapters and 5 usb adapters). About an hour ago I finished plugging the numbers into an excel spreadsheet. The 5 cards are sandisk class 4, 8 gig microsd cards. All the adapters used in this particular test are made by sandisk as well.

When I get home from my vacation i'll upload the spreadsheets and the results in my thread. I get home on Sunday, i'll post it on Monday. Being on vacation, i'm doing other things too besides playing with the numbers, but the tedious stuff is done now, it's just averaging the results at this point.

Meantime, I have some preliminary results using the other memory cards and readers I had already put up in the thread, in case you are interested.
[Nook Color General] wwejr4540:
I found similar differences (post #182) testing cards before I got my Nook. Guess I need to test in the Nook now, just out of curiosity.
[Nook Color General] androidmonkey:
Is there a "cliff notes" version of this thread, basically saying which card is the best-bang-for-buck as a boot card?
[Nook Color General] a.fenderson:
I think most people would agree that "Sandisk Class 2 or Class 4" is a pretty good general rule, but there may be exceptions.
[Nook Color General] flatgreg:
Unreal results?

A couple weeks back I tested my transcend 8g class 6 card out, and it tested just as bad as all the non-sandisk ones. So this weekend I went to costco and got a Sandisk 8gb class 2, put it in the card reader, and got equally bad results! tried a second card reader, same thing.

I read the latest posts here on testing with the nook hooked up to a pc via USB, and here's what I got:

-----------------------------------------------------------------------

CrystalDiskMark 3.0.1 x64 (C) 2007-2010 hiyohiyo

-----------------------------------------------------------------------

* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

Sequential Read : 18.474 MB/s

Sequential Write : 4.353 MB/s

Random Read 512KB : 18.532 MB/s

Random Write 512KB : 2.656 MB/s

Random Read 4KB (QD=1) : 1.377 MB/s [ 336.1 IOPS]

Random Write 4KB (QD=1) : 4.576 MB/s [ 1117.2 IOPS]

Random Read 4KB (QD=32) : 5.298 MB/s [ 1293.4 IOPS]

Random Write 4KB (QD=32) : 4.676 MB/s [ 1141.6 IOPS]

Test : 50 MB [K: 0.0% (0.5/7572.0 MB)] (x1)

Date : 2011/06/13 0:03:22

OS : Windows 7 Home Premium Edition SP1 [6.1 Build 7601] (x64)

Those random writes seem a little unreal, like too good to be true. I haven't installed an OS yet on the card so I don't have feedback yet on how good it performs in day to day use.
[Nook Color General] crazylilazn:
So, I bought a Sandisk Class 4 8GB card, and I ran it through Crystal Disk Mark, and got a Random 4 KB QD=32 value of around 1.04. I booted up from my SD and it was a lot smoother and faster than my old card. But, then I tried installing CM7 to my eMMC, and I was amazed by how much more stable it was.

Basically, is a ROM that's booted from the eMMC always going to more smooth and stable than an SD card boot? Or are there always going to be discrepancies that can't be remedied just because you're using an SD card? I had been hoping to leave my NC interal eMMC stock while I messed around happily on my SD card, but as of right now it doesn't seem possible.
[Nook Color General] pchoi94:
That's a good question. I'm not sure what the answer is, but I can tell you that my experience with CM7 Nightly build 97 on my new Sandisk 8GB Class 2 from Costo is WAY WAY WAY better than the 7.1 Beta (2.6.32) was on the Sandisk 16GB Class 4 from Radio Shack, which itself was WAY WAY WAY better than the 7.0.2 build on my older Kingston 16GB Class 2.

I know, that's a lot of variables there. But right now, it is so silky smooth, no stutter ever, no force closes or issues whatsoever. Faster than the stock ROM on internal EMMC. And I'm not even overclocking.
[Nook Color General] Blue6IX:
I run from the sdcard, not the eMMC, and it runs great. I'm using a SanDisk 16 gig class 2, that tests at a little over 1.6 on random write QD=32.

Runs the pulse news app flawlessly, and even samurai 2 with only the tiniest bit of lag.

Try getting the app "sd speed increase", you can find it on the google market, it's by a member of this community. It makes a dramatic difference in running the android os from the sdcard.

I've gotten decent results with the SanDisk 8 gig class 4 I have that tests a little over 1.0 on random write QD=32, but haven't run it as hard as my better 16.

See my sig for the link to the version of android i'm running from the card.
[Nook Color General] crazylilazn:
Alright, I re-ran my Sandisk C4 8GB through CrystalDiskMark again, and I got 1.153. It's on the lower end of most everyone elses' benchmarks. Should I return mine to Fry's and get a replacement in the hopes that it will go up? Or should I just leave it as it is?

And thanks for the suggestion about the SD Speed Increase app. I actually have that on my N1, but I hadn't thought about running it on my NC. I'll give that a shot!
[Nook Color General] :
Has anyone with a non-Sandisk card tested to see if this app helps performance? I already returned my Transcend 8GB Class 6 for my Sandisk 8GB Class 4 so I can't test for myself.
[Nook Color General] Blue6IX:
It helped a lot with my PNY class 10, which didn't test so great with the small block write. This card was just at the edge of being able to run it well, and with that app it gave it the little boost it needed to get things going reasonably well.

I still use it on my current SanDisk card, and it helps there too.

Since the bottleneck seems to be how much data the card itself can que up before it craps out, increasing the buffer of data on the device before it gets sent to the card gives it a fighting chance to keep up with what you're throwing at it.
[Nook Color General] androidmonkey:
Is there a reason why its better to run CM7 from SD versus the internal memory? Can you revert back to stock if you flash the internal?